Abstract
This is a research paper on the development of the water resources of Ojika isolated island adjacent to Nozaki island located in Nagasaki prefecture. Nozaki island is a small island having an area of 7km^2, and the mountain has a steep altitude ranging from 240m to 350 m. The rainfall concentrates only during the typhoon and in the rainy season. Moreover, considering the fact that there exists a National Park, it is necessary to construct an intake of water so that it insures to obtain most water from the smallest torrent intake works. Further more, care is to be taken to avoid the mixing of dead leaves and sand with water. Therefore, the intake method for water discharge, the trap-dam and the planning of water utilization etc. should be properly designed which acts as the primary factors of planning of the project. So, it is considered that the planned research will be a standard design for ensuring good water resources in a small island like the Nozaki isolated island.
